. : : 



A Study of the Development of 

 Dumontia Filiformis 



DISSERTATION 



SUBMITTED TO THE BOARD OF UNIVERSITY STUDIES OF THE JOHNS HOPKINS 



UNIVERSITY IN CONFORMITY WITH THE REQUIREMENTS FOR 



THE DEGREE OF DOCTOR OF PHILOSOPHY 



BY 



GRACE A. DUNN 



I 



-M 3 4-%l> 



BALTIMORE 

 JUNE, 1915 



